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Mitsubishi Electronics MUZ-D36NA manual

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Table of contents for the manual

  • Page 1

    SER VICE MANUAL CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. P ART NAMES AND FUNCTIONS ····················· 3 3. SPECIFICA TION ················································ 4 4. OUTLINES AND DIMENSIONS ······?[...]

  • Page 2

    2[...]

  • Page 3

    3 3 1 TECHNICAL CHANGES MUZ-D30NA MUZ-D30NA - U1 MUZ-D36NA MUZ-D36NA - U1 MUY -D30NA MUY -D36NA 1. New model P ART NAMES AND FUNCTIONS 2 MUZ-D30NA MUY -D30NA Piping Air outlet Drain hose Drain outlet Air inlet (back and side) MUZ-D36NA MUY -D36NA[...]

  • Page 4

    4 4 3 SPECIFICA TION Item Model MSZ-D30NA MSY -D30NA MSZ-D36NA MSY -D36NA Capacity Rated(Minimum~Maximum) Cooling 1 Btu/h 30,700 (9,800 ~ 30,700) 30,700 (9,800 ~ 30,700) 32,000/33,200 (9,800 ~ 32,000) / (9,800 ~ 33,200) 33,200/34,600 (9,800 ~ 33,200) / (9,800 ~ 34,600) Heating 47 1 Btu/h 32,600 (8,700 ~ 34,000) — 35,200 (8,700 ~ 36,000) — Capac[...]

  • Page 5

    5 5 T est condition ARI Mode T est Indoor air condition Outdoor air condition Dry bulb (°F) Wet bulb (°F) Dry bulb (°F) W et bulb (°F) SEER (Cooling) "A" Cooling Steady State at rated compressor Speed 80 67 95 (75) "B-2" Cooling Steady State at rated compressor Speed 80 67 82 (65) "B-1" Cooling Steady State at mini[...]

  • Page 6

    6 Open as a rule 20 inch or more if the front and both sides are open 4 inch or more / 8 inch or more if there are obstacles to both sides Open as a rule 20 inch or more if the back, both sides and top are open 14 in . or more 4 i n . or more REQUIRED SP ACE 6 OUTLINES AND DIMENSIONS 4 Unit: inch MUZ-D30NA MUZ-D36NA MUY -D30NA MUY -D36NA[...]

  • Page 7

    7 7 5 WIRING DIAGRAM MUZ-D30NA MUZ-D36NA[...]

  • Page 8

    8 8 MUY -D30NA MUY -D36NA[...]

  • Page 9

    9 9 6 REFRIGERANT SYSTEM DIAGRAM Unit:inch MUZ-D30NA MUZ-D36NA MUY -D30NA MUY -D36NA Outdoor heat exchanger Flared connection Defrost thermistor RT6 1 Service port Service port Discharge temperature thermistor RT6 2 Flared connection Stop valve Stop valve (with service port) Capillary tube Refrigerant flow in cooling Compressor 4-way valve Refriger[...]

  • Page 10

    10 Max. length A Max. Height difference B Indoor unit Outdoor unit MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Model Refrigerant piping : ft. Piping size O.D : in. Max. Length A Max. Height difference B Gas Liquid MUZ-D30NA MUZ-D36NA MUY -D30NA MUY -D36NA 100 50 5/8 3/8 ADDITIONAL REFRIGERANT CHARGE (R410A:oz.) Refrigerant piping exce[...]

  • Page 11

    11 D ATA 7 MUZ-D30NA MUZ-D36NA MUY -D30NA MUY -D36NA 7-1. PERFORMANCE DA T A 1) COOLING CAP ACITY Model Indoor air Outdoor intake air DB temperature ( ˚ F) IWB 75 85 95 105 1 15 ( ˚ F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC MUZ-D30NA 71 37.6 19.1 3.43 35.2 17.8 3.75 33.0 16.7 4.04 30.7 15.6 4.25 28.2 14.3 4.43 67 35.6 22.8 3.23 33[...]

  • Page 12

    12 12 7-2. PERFORMANCE CURVE 65 70 75 75 70 65 45 40 35 30 25 20 15 Indoor intake air DB temperature (°F ) = 848 CFM Airflow 15 25 35 45 55 Outdoor intake air WB temperature (°F) 4.0 3.6 3.2 2.8 2.4 Indoor intake air DB tem perature (°F) T otal power consumption (kW) T otal capacity (1 0 3 Btu/h) 65 70 75 75 70 65 48 43 38 33 28 23 18 Indoor int[...]

  • Page 13

    13 13 7-3. CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-D36NA (PSIG) Condensing pressure 86 80 75 70 68 70 75 80 85 90 95 100 105(°F) 90 100 11 0 120 130 140 150 Suction pressure Outdoor ambient temperature (PSIG) 86 80 75 70 68 70 75 80 85 90 95 100 105(°F) 260 300 [...]

  • Page 14

    75 70 65 75 70 65 (PSIG) (PSIG) Condensing pressure Outdoor ambient temperature 14 20 25 30 35 40 45 50 55 60 65 70 (°F) 200 500 480 460 440 420 400 380 360 340 320 300 280 260 240 220 Ind oor DB tem perat ure( °F) Suction pressure Outdoor ambient temperature 14 20 25 30 35 40 45 50 55 58Hz 58Hz 60 65 70(°F) 140 130 120 150 11 0 100 90 80 70 60 [...]

  • Page 15

    15 15 7-4. ST ANDARD OPERA TION DA T A Model MSZ-D30NA MSZ-D36NA MSY -D30NA MSY -D36NA Item Unit Cooling Heating Cooling Heating Cooling Cooling T otal Capacity Btu / h 30,700 32,600 32,000/33,200 35,200 30,700 33,200/34,000 SHF — 0.64 — 0.62 — 0.64 0.62 Input kW 3.85 3.36 4.14/4.36 3.84 3.38 4.21/4.24 Rated frequency Hz 84 84 91 91 79 92 Ele[...]

  • Page 16

    16 7-5. CAP ACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-D36NA Capacity correction factors Input correction factors Input correction factors Capacity correction factors Correction of Cooling capacity The operational frequency of compressor Correction of Cooling total input The operational frequency of compressor Correction of Heating[...]

  • Page 17

    17 7-6. TEST RUN OPERA TION (How to operate fixed-frequency operation) 1. Press EMERGENCY OPERA TION switch to COOL or HEA T mode (COOL : Press once, HEA T : Press twice). 2. T est run operation starts and continues to operate for 30 minutes. 3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEA T mode. 4. Indoor fan operates at Hi[...]

  • Page 18

    18 8 ACTUA TOR CONTROL MUZ-D30NA MUZ-D36NA MUY -D30NA MUY -D36NA 8-3. Relation between main sensor and actuator Sensor Purpose Actuator Compressor LEV Outdoor fan motor R.V . coil Indoor fan motor Discharge temperature thermistor Protection ○○ Indoor coil temperature thermistor Cooling : Coil frost prevention ○ Heating : High pressure protect[...]

  • Page 19

    19 SER VICE FUNCTIONS 9 MUZ-D30NA MUZ-D36NA MUY -D30NA MUY -D36NA 9-1. PRE-HEA T CONTROL If moisture gets into the refrigerant cycle, or when refrigerant is lique fi ed and col- lected in the compressor , it may interfere the start-up of the compressor . T o improve start-up condition, the compressor is energized even while it is not operating. Th[...]

  • Page 20

    20 10 TROUBLESHOOTING 10-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. T ake care of the following during servicing 1) Before servicing the air conditioner , be sure to turn OFF the main unit first with the remote control[...]

  • Page 21

    21 Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur [...]

  • Page 22

    22 Does left lamp of OPERA TION INDICA TOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: The outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the left lamp of OPERA TION INDICA TOR lamp. 2 Ye s (Blinks ) No (OFF) The outdoor unit might be abnormal. Con fi rm if outdoor unit is abnormal accordi[...]

  • Page 23

    23 3. Outdoor unit failure mode table MUZ-D30NA MUZ-D36NA MUY -D30NA MUY -D36NA The left lamp of OPERA- TION INDICA TOR lamp (Indoor unit) Abnormal point (Failure mode / protection) LED indication (Outdoor P .C. board) Condition Correspondence Indoor/outdoor unit failure mode recall function LED 1 LED 2 OFF Non (Normal) — — — — — 2-time ?[...]

  • Page 24

    24 The left lamp of OPERA- TION INDICA TOR lamp (Indoor unit) Abnormal point (Failure mode / protection) LED indication (Out- door P .C. board) Condition Correspondence Indoor/outdoor unit failure mode recall function LED 1 LED 2 1 1-time fl ash Converter 5 times Goes out A failure is detected in the operation of the converter dur- ing operation. [...]

  • Page 25

    25 The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF . (Example) When the flashing frequency is “2”. ON OFF 2.5-second OFF 2.5-second OFF 0.5-second ON 0.5-second ON Outdoor electronic control P .C. board(Parts side) Lighting LED2 LED1 10-3. TROUBLESHOOTING CHECK T ABLE MUZ-D30NA MUZ-D36NA MUY -D30NA MUY[...]

  • Page 26

    26 No. Symptom Indication Abnormal point / Condition Condition Correspondence LED1 (Red) LED2 (Y ellow) 20 Outdoor unit oper- ates. Once Lighting Primary current protection The input current exceeds 15 A. These symptoms do not mean any abnormality of the product, but check the following points. Check if indoor fi lters are clogged. Check if refrig[...]

  • Page 27

    27 10-4. TROUBLE CRITERION OF MAIN P ARTS MUZ-D30NA MUZ-D36NA MUY -D30NA MUY -D36NA Part name Check method and criterion Figure Defrost thermistor (RT61) ( MUZ ) Ambient temperature thermistor (RT65) Outdoor heat ex- changer temperature thermistor (RT68) Measure the resistance with a tester . Refer to 10-6. “T est point diagram and voltage”, 1.[...]

  • Page 28

    28 OPERA TION / INDICA TOR lamp flashes 5-times. Outdoor unit does not operate. 10-5. TROUBLESHOOTING FLOW Measure the voltage between each lead wire leading to the compressor . U (BLK) - V (WHT) V (WHT) - W (RED) W (RED) - U (BLK) Is voltage output on right table? Ye s No Disconnect the terminal of the compressor . 3 minutes after turn- ing on the[...]

  • Page 29

    29 OPERA TION INDICA TOR lamp flashes 6-times. Thermistor is abnormal. Thermistor Symbol Connector , Pin No. Board Defrost ( MUZ ) RT61 Between CN661 pin1 and pin2 Outdoor electronic control P .C. board Discharge temperature RT62 Between CN661 pin3 and pin4 Outdoor heat exchanger temperature RT68 Between CN661 pin7 and pin8 Ambient temperature RT65[...]

  • Page 30

    30 Heating operation does not work. • Is there voltage of 208 / 230 V AC between pin1 and pin 2 at connector CN912? Ye s No Disconnect the lead wire leading to the compressor . 3 minutes after turning on the power supply , start EMERGENCY OPERA TION in HEA T mode. 1. 2. T urn off power supply of indoor and outdoor unit, and discon- nect the conne[...]

  • Page 31

    31 Fan motor does not operate or stops operating shortly after starting the operation. Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 10-4.) Check the connection between the connector CN931 and CN932. Disconnect CN932 from outdoor electronic control P .C. board, and turn on the power supply . Rotate the outdoor fan[...]

  • Page 32

    32 G Check of LEV When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit gets warm. T urn ON power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely . Is "click - click" sound heard? Or , do you feel vibration of the LEV coil with a hand? Disconnect th[...]

  • Page 33

    33 • Unit cannot operate neither by the remote controller nor by EMERGENCY OPERA TION switch. Indoor unit does not operate. • OPERA TION INDICA TOR lamp flashes ON and OFF in every 0.5 seconds. Outdoor unit doesn’t operate. Outdoor electronic control P .C. board Blinking Lighted (Parts side) LED2 LED1 T urn OFF the power supply . Is there rat[...]

  • Page 34

    34 1. Disconnect the connector CN681 in the electronic control P .C. board. 2. Check the resistance of HPS 1 minute after the outdoor unit power supply was turned OFF . Check the resistance between each terminal. Is HPS protection displayed immediately after compressor starts? Replace HPS. Replace the outdoor electronic control P .C. board. Normal [...]

  • Page 35

    35 J Electromagnetic noise enters into TV sets or radios Ye s Is the unit grounded? No Ground the unit. Ye s Is the distance between the antennas and the indoor unit within 9.91 ft., or is the distance between the antennas and the outdoor unit within 9.91 ft.? No Extend the distance between the antennas and the indoor unit, and/or the antennas and [...]

  • Page 36

    36 -4 14 32 50 68 86 104 100 90 80 70 60 50 40 30 20 10 0 32 50 68 86 104 122 140 158 176 200 180 160 140 120 100 80 60 40 20 0 Resistance (k Ω ) Resistance (k Ω ) T emperature (°F) T emperature (°F) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Fin temperature thermistor (R[...]

  • Page 37

    37 MUZ-D30NA MUZ-D36NA MUY -D30NA MUY -D36NA 2. Noise filter P .C. board { MUZ CN912 R.V . coil 208 / 230 V AC 60 Hz Output 208 / 230 V AC 60 Hz Input 208 / 230 V AC 60 Hz Output F64 FUSE 2 A / 250 V CN902 T o power board { CN903 T o power board { CN61 NR64 V ARISTOR { CN901 T o electronic control P .C. board[...]

  • Page 38

    38 MUZ-D30NA MUZ-D36NA MUY -D30NA MUY -D36NA 3. Outdoor power board 294-370 VDC Output Connect to the compressor V oltage among phases: 180 V Connect to the earth CN5 Primary current detection (Connect to the noise filter) CN2 Connect to the controller board (+)1-5(–): Signal transmission (T o electronic control P .C. board) 5 VDC pulse wave (+)2[...]

  • Page 39

    39 OPERA TING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover . (4) Remove the service panel. (5) Remove the top panel. (6) Remove the valve cover . (7) Remove the screws of the cabinet. (8) Remove the cabinet. (9) Remove the screws [...]

  • Page 40

    40 OPERA TING PROCEDURE PHOT OS 2. Removing the inverter assembly , P .C. board and power board (1) Remove the top panel, cabinet, service panel and the back panel. (Refer to 1.) (2) Disconnect the following connectors; <Electronic control P .C. board> CN931 and CN932 (Fan motor) CN795 (LEV) CN661 (Discharge temperature thermistor , defrost t[...]

  • Page 41

    41 OPERA TING PROCEDURE PHOT OS 4. Removing the defrost thermistor (MUZ), discharge temperature thermistor , outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the top panel, cabinet, service panel and the back panel. (Refer to 1.) (2) Disconnect the following connectors; <Electronic control P .C. board&g[...]

  • Page 42

    42 OPERA TING PROCEDURE PHOT OS 6. Removing the compressor and 4-way valve (1) Remove the top panel, cabinet, service panel and the back panel. (Refer to 1.) (2) Remove the inverter assembly . (Refer to 2.) (3) Remove the R.V . coil. (Refer to 3.) (4) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gaug[...]

  • Page 43

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  • Page 44

    HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAP AN Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,L TD Distributed in Feb. 2008. No. OBH502 7 Made in Japan New publication, effective Feb. 2008 Specifications subject to change without notice. TM[...]